β 2-agonists were introduced in the 1940s as bronchodilators to be used in obstructive respiratory diseases. Long-acting β 2-agonists have been a mainstay of bronchodilating treatment for decades. Recently, agents extending their effect to 24 hours and thus allowing the once-daily administration were introduced, defined as very-long-acting β 2-agonists. Olodaterol is a new very-long-acting β 2-agonist that has been shown, in controlled trials, to improve lung function as well as clinical outcomes and quality of life. Most of these trials included patients with moderate, severe, or very severe chronic obstructive pulmonary disease (COPD). Olodaterol has a rapid onset of action (comparable to formoterol) and provides bronchodilation over 24 hours. In controlled trials, olodaterol was shown to be as effective as formoterol twice daily, but significantly superior in terms of quality of life in patients with COPD. The safety profile of olodaterol was very good, with a rate of adverse events, including the cardiac events that are particularly important for β 2-agonists, comparable to placebo. Also, the efficiency of the Respimat ® device concurs to the effectiveness of treatment.